Polyurethane Mold Info

• Some release lubricants/agents attack different types of rubber in different ways. Lubricants like old/new motor oil, diesel, and old cooking oil etc. should never be used on your Polyurethane Rubber Mould. (or any other rubber mould)

• Always support or brace your mould with wood or plywood around the sides and bottom to ensure true shape and minimal stresses on the mould outer sides.

• Avoid mould exposure to the sun. Shade is always the better option for any rubber product.

• Never hit your mould with an object/hammer to de-mould your concrete products. If our prescribed release agent is used, your product will de-mould easily.

• Never use sharp objects to clean or scrape off concrete residue from your mould. Your mould is extremely abrasive resistant, but not cut resistant!

• Always clean your mould with water and a semi-soft brush after use. High-pressure cleaners can be used, but with caution - nozzle not closer than 40 cm. Remove all cement-based residue. (Start each day with a clean mould)

• The highest temperature at which your mould should be used is 50 - 85 deg Celsius. Your polyurethane mould can tolerate short period temperature increases of up to approximately 120 deg Celsius.

A company called Achak offers a cost effective release agent/oil, suitable for use with Polyurethane Rubber Moulds

• It will not evaporate off the mould by heat, neither will solvent free water or rain wash it off.
• It does not contain solvents and is therefore suitable for most rubber products. 
• Coverage is 8 – 10 square meters per liter, and it can be sprayed, brush or rolled onto the mould.

Downloads, Mold & Delivery info

• Concrete Mix Formulas  10, 20 & 30 MPa  - DOWNLOAD

• Molds Delivery Rates

• Concrete Molds Price List

• Cashbuild Concrete Mix Calculator